package org.smart4j.framework.helper;

import org.smart4j.framework.annotation.Action;
import org.smart4j.framework.bean.Handler;
import org.smart4j.framework.bean.Request;
import org.smart4j.framework.util.ArrayUtil;
import org.smart4j.framework.util.CollectionUtil;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * ControllerHelper
 * 控制器助手类
 *
 * @author sc
 * @date 2016-6-15
 */
public final class ControllerHelper {

    /**
     * 用于存放请求与控制器的映射关系
     */
    private static final Map<Request, Handler> ACTION_MAP = new HashMap<Request, Handler>();

    static {
        //获取所有Controller类
        Set<Class<?>> controllerClassSet = ClassHelper.getControllerClassSet();
        if (CollectionUtil.isNotEmpty(controllerClassSet)) {
            for (Class<?> controllerClass : controllerClassSet) {
                //获取Controller类中定义的方法
                Method[] methods = controllerClass.getDeclaredMethods();
                if (ArrayUtil.isNotEmpty(methods)) {
                    //判断当前方法是否带有Action注解
                    for (Method method : methods) {
                        if (method.isAnnotationPresent(Action.class)) {
                            //从Action注解中获取URL规则
                            Action action = method.getAnnotation(Action.class);
                            String mapping = action.value();
                            //验证URL规则
                            //if(mapping.matches("\\w+:/\\w*")){
                            String[] array = mapping.split(":");
                            if (ArrayUtil.isNotEmpty(array) && array.length == 2) {
                                //获取请求方法与请求路劲
                                String requestMethod = array[0];
                                String requestPath = array[1];

                                Request request = new Request(requestMethod, requestPath);
                                Handler handler = new Handler(controllerClass, method);
                                //初始化Action Map
                                ACTION_MAP.put(request, handler);
                            }
                            //}
                        }
                    }
                }
            }
        }
    }

    /**
     * 获取Handler
     *
     * @param requestMethod
     * @param requestPath
     * @return
     */
    public static Handler getHandler(String requestMethod, String requestPath) {
        Request request = new Request(requestMethod, requestPath);
        return ACTION_MAP.get(request);
    }
}
